Altronix T2HWK78DV Trove2 8-Output 24VDC PTC Controller
The Altronix T2HWK78DV is an 8-output 24VDC power distribution controller designed for access control and surveillance deployments requiring individual circuit protection without manual fuse maintenance. Each output is rated 10A and protected by a Positive Temperature Coefficient (PTC) resettable fuse that automatically recovers when an overcurrent condition clears, eliminating downtime from blown fuses during transient load spikes or short circuits. The T2HWK78DV integrates directly into the Trove2 modular power platform, consolidating multiple distribution circuits into a single rack- or wall-mountable enclosure.
Key Features
- 8 Independently Protected Outputs: Each channel carries its own PTC resettable fuse. Automatic recovery restores power when the fault clears—no technician visit, no inventory of replacement fuses.
- 10A Per-Channel Capacity: Supports high-current access control modules, door strikes, mag locks, and IP camera PoE injectors on individual circuits without overload interaction.
- 24VDC Standard Voltage: Operates across virtually all access control, intercom, and PoE camera power ecosystems without additional conversion or regulation.
- Trove2 Modular Platform: Slides into Trove2 chassis alongside other controllers (relay cards, dial-up modules, battery supervisors) for integrated infrastructure power in a single footprint.
- Automatic Fault Recovery: PTC fuses self-reset when overcurrent subsides—ideal for deployments where manual intervention is costly or where remote sites lack on-site personnel.
- Lifetime Limited Warranty: Factory-backed coverage reflects design maturity and component reliability in security infrastructure power applications.
- US Manufactured: Built in the United States, no grey-market, no parallel imports.
The T2HWK78DV operates from a VR6 voltage regulator and pairs with the included ACMS8CB dual-input access power controller, allowing redundant AC feeds or battery backup supervision to maintain 24VDC output continuity during utility failures. The modular approach consolidates power distribution, fusing, and voltage regulation into a single enclosure, reducing field wiring complexity and simplifying future circuit expansion through card insertion.
Per-output current ratings of 10A handle door strike solenoids (typically 0.5–2A continuous), mag-lock amplifiers (2–4A), and multiple IP cameras or intercom endpoints on a single circuit. If a connected device shorts or draws excessive current, the PTC fuse on that output silently limits voltage to ~0.5V, protecting the rest of the system. Once the fault clears, the fuse automatically resets—critical for unattended installations where a blown fuse would otherwise disable an entire circuit until a service call. This automatic recovery dramatically reduces mean-time-to-recovery (MTTR) in access control and perimeter security systems.
The T2HWK78DV is specified into multi-building campuses, retail chains, and industrial facilities where 24VDC power distribution is centralized but where individual tenant or departmental circuits must be isolated from each other. Integrators pair it with Altronix relay cards and battery backup modules within the same Trove2 chassis to eliminate separate power supply racks and reduce total system footprint. The 46.2 lb weight and standard 19-inch rack form factor fit into existing security closets and electrical rooms without special mounting hardware.
Compliance and integration: The T2HWK78DV carries Lifetime Limited Warranty and is manufactured in the US per security supply-chain standards. It operates with any 24VDC access control platform (Salto, Gallagher, Honeywell, HID, Bosch, etc.) and integrates into Trove2 power management workflows. See the product datasheet for connector pinouts and fusing curves.
Marty AllisonPerspective based on aggregated IP Security Depot and affiliated engineering team experience.
We've deployed Altronix Trove2 power platforms across hundreds of access control and hybrid surveillance installations, and the T2HWK78DV represents one of the most effective ways to eliminate fuse-swap labor on 24VDC circuits. The shift from cartridge fuses to PTC resettable protection transforms the operational model: instead of a facility manager stocking spare fuses and performing manual swaps, the system self-heals. On campuses with 50+ access points, that operational savings accumulates fast. The real differentiator is that PTC fuses don't just protect individual circuits—they preserve the integrity of parallel circuits by preventing a short on one channel from affecting another. We've seen transient shorts on door-strike wiring (water damage, installation defects) that would have blown a traditional fuse, taken down an entire 8-circuit distribution block, and idled an access system for hours pending a technician visit. With PTC, the faulted circuit silently de-energizes, other seven circuits remain live, and once the fault clears (or a technician clears water from the junction box), the system re-energizes automatically.
Technical Highlights:
- PTC Resettable Fuses (Per-Output): Each output self-limits to ~0.5V when overcurrent triggers, protecting downstream devices and sibling circuits simultaneously. Reset is automatic—no field stock of consumables, no service labor. Recovery time is typically 1–10 seconds as the fuse cools.
- 10A Per-Channel Capacity: Sufficient for door strikes (0.5–2A), mag locks (2–4A), and clusters of networked access readers or IP intercom endpoints (2–4A each). Allows circuit consolidation where older systems used one fuse per device.
- Trove2 Modular Stackability: The T2HWK78DV slides into a Trove2 chassis alongside battery backup modules (12P, 24P), relay cards (8RLY), and line-monitoring controllers. Single 24VDC rail, single AC input, redundant distribution for the entire system—eliminates separate power supply racks and consolidates maintenance windows.
- Automatic AC Failure Supervision: Works with Trove2 battery backup cards (sold separately) to monitor AC input. If utility fails, battery seamlessly maintains 24VDC to all eight outputs during switch-over—critical for access control continuity.
- Lifetime Warranty + US Manufacturing: Altronix power infrastructure is built to last; repair vs. replacement economics favor long-term retention. Field-proven design with minimal infant-mortality rates.
Deployment Considerations:
- PTC fuse reset time (1–10 seconds) is fast but not instantaneous. For ultra-critical single circuits (e.g., a sole emergency exit door strike), pair the T2HWK78DV with redundant 24VDC supplies or a monitored battery backup module to prevent even brief de-energization events.
- PTC fuses protect against short circuits and gross overcurrent but do not protect against steady-state overvoltage on the 24VDC rail itself. Use a voltage regulator (VR6 included) to maintain tight 24V tolerance—devices like door readers and intercom amplifiers often fail above 28V.
- Each output terminal is rated 10A, but connectors and field wiring must also be rated for that current. Use appropriate gauge wire (AWG 12 minimum for 10A runs over 50+ feet) and verify connector contact resistance in the field—poor connections cause nuisance PTC trips.
- The T2HWK78DV is a distribution controller, not a primary power supply. Pair it with a Trove2 primary supply chassis (125/250VA options) or external 24VDC source. The card itself does not supply or store energy.
- If deploying across multiple buildings or long cable runs, budget for voltage drop across feeder wiring. A 24VDC bus at the T2HWK78DV may read 23V or 22V at the far end of a 500-foot run under full load—plan wiring gauge and/or active regulation accordingly.
The T2HWK78DV is the right fit for integrators managing hybrid access control and camera power on 24VDC, particularly in multi-location deployments where fuse-swap labor is a cost driver. It's equally valuable on single large-campuses where circuit isolation and automatic fault recovery reduce incident response time. If your project requires per-circuit protection without manual intervention and integrates into modular Trove2 infrastructure, this is a mature, field-proven choice. For more information on Altronix power distribution and Trove2 platform options, visit the Altronix catalog.
